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Systemic Analysis of Different Colorectal Cancer Cell Lines and TCGA Datasets Identified IGF-1R/EGFR-PPAR-CASPASE Axis as Important Indicator for Radiotherapy Sensitivity

Systemic Analysis of Different Colorectal Cancer Cell Lines and TCGA Datasets Identified IGF-1R/EGFR-PPAR-CASPASE Axis as Important Indicator for Radiotherapy Sensitivity

Lin Chen, Zhe Zhu, Wei Gao, Qixin Jiang, Jiangming Yu, Chuangang Fu

Gene. 2017 Sep 5;627:484-490.

PMID: 28687332

Abstract:

Insulin-like growth factor 1 receptor (IGF-1R) is proved to contribute the development of many types of cancers. But, little is known about its roles in radio-resistance of colorectal cancer (CRC). Here, we demonstrated that low IGF-1R expression value was associated with the better radiotherapy sensitivity of CRC. Besides, through Quantitative Real-time PCR (qRT-PCR), the elevated expression value of epidermal growth factor receptor (EGFR) was observed in CRC cell lines (HT29, RKO) with high radio-sensitivity compared with those with low sensitivity (SW480, LOVO). The irradiation induced apoptosis rates of wild type and EGFR agonist (EGF) or IGF-1R inhibitor (NVP-ADW742) treated HT29 and SW480 cells were quantified by flow cytometry. As a result, the apoptosis rate of EGF and NVP-ADW742 treated HT29 cells was significantly higher than that of those wild type ones, which indicated that high EGFR and low IGF-1R expression level in CRC was associated with the high sensitivity to radiotherapy. We next conducted systemic bioinformatics analysis of genome-wide expression profiles of CRC samples from the Cancer Genome Atlas (TCGA). Differential expression analysis between IGF-1R and EGFR abnormal CRC samples, i.e. CRC samples with higher IGF-1R and lower EGFR expression levels based on their median expression values, and the rest of CRC samples identified potential genes contribute to radiotherapy sensitivity. Functional enrichment of analysis of those differential expression genes (DEGs) in the Database for Annotation, Visualization and Integrated Discovery (DAVID) indicated PPAR signaling pathway as an important pathway for the radio-resistance of CRC. Our study identified the potential biomarkers for the rational selection of radiotherapy for CRC patients.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP475488234	NVP-ADW742		475488-23-4	Price

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